It looks like there might be something to the old image of raccoons as thieves. A few studies have been done to confirm this. In a study done in 1908, raccoons were able to open eleven out of thirteen complex locks in less than ten tries and could repeat the action flawlessly when the locks were rearranged or turned upside down.
It’s since been concluded that they understand the principles of locking mechanisms. In the sixties, seventies, and nineties, more studies were conducted that focused on memory.
These tests showed that raccoons can remember the solutions to tasks for up to three years, even being able to instantly tell the difference between identical and different symbols after three years. So don’t feel bad if one breaks into your house. Just get better locks.